.summitFrom{
    padding: 10px;
    margin-left: 33%;
    min-width: 300px;
    min-height: 650px;
    max-width: 500px;
    max-height: 1500px;
    border: solid;
    border-color: #9a9696;
    border-radius: 3%;
    opacity: 0.9;
    background-color: white;
}
.submmitBtn{
    margin-left: 40%;
    margin-top: 16px;
}
body{
    background-image: url("../images/图书登记背景图.jpg");
    background-size: 100%;
}
